Air pump



' W. J. HAWKINS AIR PUMP Filed Oct. 14. 1921 IN VENTOR a citizen of the United of New York, have invented-a .new and useful Improvement in Alr the followmg 1s a specification.

Patented Nov. 25, 1924.

wILroRD J. HAWKINS, on NEW- YORK, N. Y. I

AIR IPUMP.

Application filed October 14, 1921. Serial No. 507,603.

To all whom it may concern:

Be it known that I,WILFORD J. HAWKINS,

States, residing at New York, county of New York, and State Pumps, of which .This invention relates to an improvement in air pumps designed to be used in connection with an engine cylinder and operated by the pressure from said cylinder tocompress air for etc.. and it consists in which v'ill be hereina like characters of tire inflation, whistle blowing,

certain constructions ft'er fully described and then specifically set forth in the claim drawing, which forms ation and in which reference indicate the same or like parts, is a sectional elevation of a device constructed in invention.

accordance with the In carrying the invention into effect, there is provided a small air low stem adapted to engine cylinderfor example,

pump having a holbe screwed lnto an in place ofa priming cup,-to establish pressure communication between said cylinder and said pump, the operatlon of the pump being effected by the: pressure In the best constructions.

engine cylinder. the device is provided operated in the hollow ing device in derived from the with a cut-off valve stem and with a primcommumcation wlth the interior of the stem above the cutoff valve.

Referring to'the pump cylinder having drawing, 1 indicates a its lower end closed bv an integral head 2' from which depends a hollow stem 3.- This st an external thread 1 cm is provided with by means of which it may be connected to an engine ,cylinder 5. \Vorking 1n the cylinder 1 1s a plunger 6 provided with I pose of normally holdl its lowermost position. drawing, there 1s provided a helical spring' 8 bearing against the plunger and against a head 9 screwed der 1 at 10. The cylind piston rings 7. For the purug the plunger 6 111 as shown In the upper face of the removable cylinder on the exterior of the cyliner 1 is provided with a series of inlet ports 11 cut through its wall just above the top of the plunger 6 when in its lowermost position. The cylinder head 9 is provided with a ball check valve 12 held in place by means ofa spring 13, the upper end of which bears against a plug 14 screwed into the cylinder head 9. The ball check valve operates in a passage 15 of the usual kind, and this passage is in open communication with a transverse pas-- sage 16. An air pipe 17 coacts with the passage 16 and is held to the cylinder head 9- by means of a union 18 of well known construction. V

For the purpose of cutting off communication between the air pump and the engine .cylinder 5, there is provided a cutoff valve 19 located in the interior of the stem 3 and operated by means of a-handle 20. For-the purpose of providing a priming device to be used with the air pump when the latter is used in connection with an internal combus tion engine cylinder, a hole 21 is drilled in the closed end of the cylinder 1 to open into the hollow stem 3, and a priming device 22 of ordinary construction is screwed to the air pump in operative connection with the hole 21 so that when the cutoff valve 19 is open the engine cylinder can be primed.

When the cutoff valve 19 is open, pressure from the engine cylinder 5 drives the plunger 6 up against the resistance of the spring 8, compresses the air above it. and drivesthe most of it out past'the ball check valve 12 and through the pipe 17 to a suitable storage receptacle, not shown. Vhen the pressure is relieved, the spring 8 returns the plunger 6 to its lowermost position; and when "it reaches this position. the cylinder l'is again filled with air through the inlet ports 11 by atmospheric pressure.

It will of course be understood that when the cutoff valve is closed, there is no pressure communication between the air pump and engine cylinder, and that t-herefore the air pump is out of action.

Changes and variations may be made in the specific structure by means of which the invention is carried into etfectr The invention, therefore, is not to be'restricted to the precise details of the structure shown and described.

hat is claimed is:

An air pump provided with a hollow stem adapted to be screwed. into an engine cylinder to establish explosion pressure communication between said cylinder and said. pump, a cutoff valve operative in said stem, and a priming device in communication with the interior of said stem above said valve, said 10 pump having a cylinder with intake ports in its Wall, a spring-pressed, and pressure In testimony whereof, I have signed my 15 name to this specification.

WiLroRn J. HAWKiNS. 

